My 06 WRX recently is idling strangely... it's a little "jumpy". It'll hold around 700 rpm, then drop to almost nothing, then jump above 1000 as it settles back to around 700 again. It's worse/more noticeable when the climate control is on. Also, it occasionally stalls out at idle, or near idle. The other day it was in neutral, no a/c on, and it just shut off. It stalls out VERY gently, you wouldn't notice with the radio on. I've noticed it does it to me occasionally when I back up and then try to shift into first. Any ideas? I read a couple of the other threads but didn't see anything for an 06/07.